Not sure if this has come up at all before but I hate completing quests on the Kumos version of the site because I can't stand the shop system. I like a lot of the quest efficiency - having the quest display at the top etc - but no feedback from if an item has been purchased at a shop drives me insane.
I'm not always glued to my computer. I normally do quests simultaneously with something on tv or talking to someone. I'm not staring at the screen. Did the item get purchased? Did it not? Did I even click it in the first place?
I'm aware that it shows if you have the item in a quest, but if I was simply buying items in general I would never choose to do it on the Kumos site because I have to check my own inventory every minute.....